Numerous studies show that male behavior is heavily influenced by the operational sex ratio–or the ratio between fertile females and sexually active males. If male and female numbers are equal then the best strategy is for a male to find a female, pair off, and protect/provide for his own kids. If there are more fertile females than males, the best mating strategy for males is to put less resources caring for their kids and more resources trying to mate with multiple females. (note l: urban blacks in America fall into this category because of the amount of young black males either in prison or killed by other black males. result is that black males spend more time chasing other women and less time being fathers) (note 2: possibly bigamy became common in these societies to prevent the excess of available females from encouraging men to sleep around instead of be fathers)

If there are more males than females, the males that have mates get obsessed with protecting them from the surplus males, who form rape gangs to try to get access to the smaller numbers of females. In polygamous societies, every man that has two wives creates a man who can never mate unless he rapes. Bigamy effectively turns a balanced operational sex ratio into a heavily male-biased one. Islam is a codified set of behaviors for protecting females from rape gangs (burka, can’t go outside without male guardian) and exporting the surplus males to neighboring societies so they don’t bother the local females (jihad). That is, essentially, Islam–a code of behaviors designed by a guy with multiple wives in a bigamous society to keep womanless men away from his wives.

The surplus males generated by bigamy are told, “These women are off-limits; they’re spoken for by more powerful men in your society. If you want to get laid, your only option is to go out and conquer something and take their women.” This is how Islam spread so quickly in its first few centuries and this is the driving force behind the huge amount of young men flooding into Europe today. They are not refugees, they are sex tourists. It should be no surprise they are so rapey.